EP4361460A1 - Screw - Google Patents

Abstract

Proposed is a screw having a thread and a conically tapered tip, wherein a cylindrical shaft is formed behind the tip, wherein a thickening is arranged behind the shaft.

Description

The invention relates to a screw according to claim 1.

In the state of the art, screws, especially wood screws, exist in different variations. However, conventional screws have the following disadvantages.

When conventional screws are screwed into the material, they cause the wood to crack, which is detrimental. In addition, conventional screws create a high level of friction when the screws are inserted.

It is therefore the object of the present invention to eliminate the disadvantages of the prior art.

This object is achieved with the subject matter of the independent claims. Advantageous developments of the invention are specified in the subclaims. The scope of the invention also includes all combinations of at least two of the features specified in the description, the claims and/or the figures. In the specified value ranges, values lying within the stated limits should also be disclosed as limit values and can be claimed in any combination.

The invention relates to a screw, in particular a wood screw, having a thread and a conical tip, with a cylindrically shaped shaft, with a thickening arranged behind the shaft.

Due to the fact that a cylindrical shaft and a thickening are arranged behind the tip, it is advantageously possible for the material, in particular the wood, into which the screw is screwed, to be severed and tearing of the material, in particular the wood, is reduced.

The screw has a longitudinal axis in the traditional way. The screw extends along this longitudinal axis from a head with a force application to the tip.

The features "behind" and "in front" are defined in such a way that the rear part of the screw is provided with the head and the front part of the screw is provided with the tip.

The feature that the cylindrical shaft is arranged behind the tip is to be understood in such a way that the cylindrical shaft is located longitudinally behind the tip when viewed from the front tip.

The terms "thread depth" and "thread pitch" are familiar to those skilled in the art.

The thread extends between the head and the tip in a conventional manner. Between the head and the thread there may be a further cylindrical shaft having a diameter larger than the core diameter of the thread. The feature of the core diameter of the thread is known to the person skilled in the art.

The thread may extend to the front end of the tip in a conventional manner. Alternatively, there may be a region at the front end of the tip where there is no thread.

In a preferred embodiment, it is provided that the thickening is cylindrical, in particular annular, in particular circular.

Alternatively, the thickening may be conical, with the thickening preferably becoming wider towards the tip.

In general, the thickening can also have other spherical shapes.

In another preferred embodiment, it is provided that a step is arranged behind the shaft, wherein the step is preferably arranged at an angle of 60° to 120° to the longitudinal axis of the screw, wherein the step is particularly preferably arranged perpendicular to the longitudinal axis of the screw.

By providing a step, it is advantageously possible for the wood to be expanded by the step when screwing in, so that the friction when screwing in the screw further can be reduced.

In another preferred embodiment, it is provided that a diameter of the thickening is between 10% and 50% of a thread depth of the thread.

In another preferred embodiment, it is provided that the thickening has a length in the direction of the screw's longitudinal axis, wherein the length is less than 5 times a pitch of the thread.

In another preferred embodiment of the invention, it is provided that the screw has at least one further thickening, wherein the at least one further thickening is arranged at the end of the thread, preferably at the transition to a shaft on a head of the screw, and/or is arranged in a region of the thread, preferably in the middle of the region.

This at least one additional thickening can widen the hole or opening into which the screw is screwed. This can reduce the friction generated by the adjoining shaft.

In particular, the shaft can be circular-cylindrical or polygonal.

For the at least one further thickening, the above provisions for the thickening apply accordingly.

The at least one further thickening can be formed identically to the thickening. The at least one further thickening can, however, also have a different formation than the thickening.

In another preferred embodiment of the invention, it is provided that the at least one further thickening is cylindrical, in particular annular, in particular circular.

In another preferred embodiment of the invention, it is provided that the at least one further thickening is conical, with the at least one further thickening preferably becoming wider towards the tip. This can widen the bore or the opening, whereby the friction can be reduced further down the line.

In another preferred embodiment of the invention, it is provided that a step is arranged on the at least one further thickening, wherein the step is preferably arranged at an angle of 60°-120° to the longitudinal axis of the screw, wherein the step is particularly preferably arranged perpendicular to the longitudinal axis of the screw.

In another preferred embodiment of the invention, it is provided that a diameter of the at least one further thickening is between 10% and 50% of the thread depth of the thread.

In another preferred embodiment of the invention, it is provided that the at least one further thickening in the direction of the screw's longitudinal axis has a length which is less than 5 times the pitch of the thread.

With regard to the advantages and further aspects of the at least one further thickening, the above statements regarding thickening apply in particular.

• Figur 1a zeigt schematisch eine erfindungsgemäße Schraube gemäß einer ersten Ausführungsform,
• Figur 1b zeigt einen Ausschnitt der Schraube aus Figur 1a, wobei die Schraube um die Längsachse um 120° im Uhrzeigersinn gedreht worden ist,
• Figur 1c zeigt den Ausschnitt der Schraube aus Figur 1b, wobei die Schraube um 120° im Uhrzeigersinn um die Längsachse gedreht worden ist,
• Figur 2a zeigt schematisch eine erfindungsgemäße Schraube gemäß einer zweiten Ausführungsform,
• Figur 2b zeigt analog Figur 1b einen Ausschnitt der Schraube aus Figur 2a, wobei die Schraube entlang der Längsachse um 120° im Uhrzeigersinn gedreht worden ist,
• Figur 2c zeigt analog Figur 1c den Ausschnitt der Schraube aus Figur 2b, wobei die Schraube um 120° im Uhrzeigersinn entlang der Schraubenlängsachse gedreht worden ist,
• Figur 3a zeigt schematisch eine erfindungsgemäße Schraube gemäß einer dritten Ausführungsform,
• Figur 3b zeigt einen Ausschnitt der Schraube aus Figur 3a,
• Figur 4 zeigt schematisch eine erfindungsgemäße Schraube gemäß einer vierten Ausführungsform.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings, each of which shows in schematic view:

• Figure 1a shows schematically a screw according to the invention according to a first embodiment,
• Figure 1b shows a section of the screw from Figure 1a , whereby the screw has been rotated 120° clockwise around the longitudinal axis,
• Figure 1c shows the section of the screw from Figure 1b , whereby the screw has been rotated 120° clockwise around the longitudinal axis,
• Figure 2a shows schematically a screw according to the invention according to a second embodiment,
• Figure 2b shows analog Figure 1b a section of the screw Figure 2a , whereby the screw has been rotated 120° clockwise along the longitudinal axis,
• Figure 2c shows analog Figure 1c the cutout of the screw Figure 2b , whereby the screw has been rotated 120° clockwise along the screw’s longitudinal axis,
• Figure 3a shows schematically a screw according to the invention according to a third embodiment,
• Figure 3b shows a section of the screw from Figure 3a ,
• Figure 4 shows schematically a screw according to the invention according to a fourth embodiment.

In the figures, advantages and features of the invention are identified with reference numerals identifying them in accordance with embodiments of the invention, wherein components or features with the same or equivalent function are identified with identical reference numerals.

The Figures 1a , 1b and 1c show schematically a screw 1 according to the invention according to a first embodiment of the invention.

The screw 1 extends along a longitudinal screw axis L. At the rear end of the screw there is a head 2 with a conventional force attack for a suitable operating tool.

In front of the head there is a cylindrical shaft with a diameter, the diameter of this shaft being larger than a core diameter of a thread 3, which is arranged in an area 7. The area 7 with the thread 3 is located in front of the cylindrical shaft when viewed in the longitudinal direction L. A chamfer is arranged between the cylindrical shaft and the area 7 with the thread 3, so that the wider diameter of the shaft tapers to the core diameter of the thread 3 in the area 7.

The thread 3 has a pitch P. In addition, the thread 3 has a thread depth t.

Furthermore, the screw 1 extends to a front end at which a conical tip 4 is located.

Behind the tip 4 extends a cylindrical shaft 5 whose length a is smaller than the pitch P of the thread 3.

A cylindrically formed thickening 6 is arranged behind the cylindrical shaft 5, wherein the length a of the thickening 6 is smaller than the pitch P.

A step 8 is arranged between the cylindrical shaft 5 and the cylindrical thickening 6, wherein this step 8 is arranged at an angle of 90° to the longitudinal axis L in this embodiment.

Behind the cylindrical thickening 6 is the area 7 with the thread 3, whereby the core diameter of the thread 3 is smaller than the diameter of the thickening 6.

In this embodiment, the thread 3 extends in the longitudinal direction L beyond the thickening 6 and also over the cylindrical shaft 5 up to the front end of the tip 4. Detailed views and twisted views are shown in the Figures 1b and 1c visible.

The Figures 2a , 2b and 2c schematically show a second embodiment of the present invention.

The screw 1' extends along a screw longitudinal axis L as in the first embodiment from a head 2 with a force application to towards a conical tip 4 in the front area of the screw 1'.

Most of the features in the second embodiment are analogous to the features and description of the first embodiment. The second embodiment has the following differences compared to the first embodiment.

Like the first embodiment, the screw 1' has a thickening 6'. In contrast to the first embodiment, the thickening 6' is designed to widen conically, with the diameter of the thickening 6' increasing in the direction of the tip. The conical thickening 6' thus begins in its rear region with the diameter of the core diameter of the thread 3 and widens to a larger diameter.

As in the first embodiment, behind the tip 4 there is the cylindrical shaft 5 with an extension in the longitudinal direction L smaller than the pitch P of the thread 3.

As in the first embodiment, there is a step 8' between the cylindrical shaft 5 and the thickening 6', wherein the step 8' extends at an angle of 90° to the longitudinal axis L.

The thickening 6' extends in the longitudinal direction L along a length a, wherein the length a in this embodiment is smaller than the pitch P of the thread 3.

For further details, please refer to the comments on the first embodiment.

The Figures 2b and 2c show twisted views of the front area of screw 1' with tip 4.

Figure 3a shows schematically a screw 1" according to the invention according to a third embodiment.

The screw 1" has a thickening 6' according to the invention at the tip 4, which in this example is analogous to the design of the Figures 2a-2c is designed. In this respect, reference is made to the explanations regarding these figures.

In this preferred exemplary embodiment, the screw 1" has a further thickening 6", which is arranged at the rear end of the region 7 with the thread 3 and is arranged at the transition to a shaft 9, wherein the shaft 9 can be cylindrical or polygonal, for example.

In this special embodiment, the further thickening 6" is designed similarly to the thickening 6' at the tip 4; in this respect, reference is made to the explanations regarding the Figures 2a-2c The further thickening 6" thus widens conically towards the tip 4.

In this embodiment, due to the further thickening 6", there is the advantage that the opening into which the screw 1" is screwed is widened by the further thickening 6" before the shaft 9 reaches the opening, whereby the friction and resistance can be significantly reduced.

Figure 3b shows a section of the screw 1" from Figure 3a , which in Figure 3a marked with a circle.

In Figure 3b It is shown that the diameter D4 of the shaft 9 is smaller than the maximum diameter D3 of the further thickening 6". This advantageously widens the opening into which the screw is screwed.

Also shown is the core diameter D1 of area 7 with thread 3, as well as the thread diameter D2 of thread 3.

The further thickening 6" extends along a length a' and widens at an angle v. The angle v is the angle between the extensions of the outer contour of the further thickening 6". The angle v is 5-30 °. In addition, a step 8" extends at the front end of the further thickening 6", which runs perpendicular to the longitudinal axis L of the screw 1". The maximum diameter D3 is at this step 8".

Figure 4 shows schematically a screw 1‴ according to the invention according to a fourth embodiment. The screw has, analogously to the embodiment of the Figures 3a and 3b a conical thickening 6' in the area of the tip 4. Furthermore, the screw 1‴ has a further thickening 6" in the rear part of the area 7 with the thread 3 in the transition to the shaft 9. In this respect, reference is made to the above explanations.

In this special embodiment, the screw 1‴ has a further, third thickening 6‴, which is arranged centrally in the area 7 with the thread 3. This embodiment thus has a total of three thickenings 6',6",6‴.

The third thickening 6‴ extends in the direction of the longitudinal axis L along a length a" and widens conically towards the tip 4 in a v'. The angle v' is 5-30 °. The angle v' is the angle between the extensions of the outer contour of the further thickening 6‴.

The third thickening 6‴ has a maximum diameter of D3' at the widest point. Diameter D3' is larger than diameter D1 of area 7.

In addition, a step 8‴ extends at the front end of the third thickening 6‴, which runs perpendicular to the longitudinal axis L of the screw 1‴. The maximum diameter D3' is located at this step 8‴.

The embodiments presented above serve only to illustrate the invention and to better understand the basic idea. The embodiments are in no way intended to limit the general inventive concept.

List of reference symbols

1,1',1",1‴

screw

2

Head

3

thread

4

Great

5

cylindrical shaft

6.6',6",6‴

thickening

7

Area

8.8',8",8‴

Level

9

shaft

L

Screw longitudinal axis

P

pitch

t

Thread depth

a,a',a"

length

v,v',w

angle

D1,D2,D3,D3',D4

diameter

Claims (12)

Screw (1,1'1",1‴), in particular a wood screw, having a thread (3) and a conically tapered tip (4), characterized in that a cylindrical shaft (5) is formed behind the tip (4), wherein a thickening (6,6') is arranged behind the shaft (5). Screw (1,1'1",1‴) according to claim 1, wherein the thickening (6) is cylindrical, in particular annular, in particular circular. Screw (1,1'1",1‴) according to claim 1, wherein the thickening (6') is conical, wherein preferably the thickening (6') becomes wider towards the tip (4) Screw (1,1'1",1‴) according to at least one of the preceding claims, wherein a step (8,8') is arranged behind the shaft (5), wherein preferably the step (8,8') is arranged at an angle (w) of 60°-120° to the screw's longitudinal axis (L), wherein particularly preferably the step (8,8') is arranged perpendicular to the screw's longitudinal axis (L) Screw (1,1'1",1‴) according to at least one of the preceding claims, wherein a diameter of the thickening (6,6') is between 10% and 50% of a thread depth (t) of the thread (3). Screw (1,1'1",1‴) according to at least one of the preceding claims, wherein the thickening (6,6') has a length (a) in the direction of the screw's longitudinal axis (L), wherein the length (a) is less than 5 times a pitch (P) of the thread (3). Screw (1,1'1",1‴) according to at least one of the preceding claims, having at least one further thickening (6",6‴), wherein the at least one further thickening (6",6‴) is arranged at the end of the thread (3), preferably at the transition to a shaft (9) on a head (2) of the screw (1,1'1",1‴), and/or in a region (7) of the thread (3), preferably in the middle of the region (7). Screw (1,1'1",1‴) according to at least one of the preceding claims, wherein the at least one further thickening (6",6‴) is cylindrical, in particular annular, in particular circular. Screw (1,1'1",1‴) according to at least one of the preceding claims, wherein the at least one further thickening (6",6‴) is conical, wherein preferably the at least one further thickening (6",6‴) becomes wider towards the tip (4) Screw (1,1'1",1‴) according to at least one of the preceding claims, wherein a step (8",8‴) is arranged on the at least one further thickening (6",6‴), wherein preferably the step (8",8‴) is arranged at an angle of 60°-120° to the screw longitudinal axis (L), wherein particularly preferably the step (8",8‴) is arranged perpendicular to the screw longitudinal axis (L) Screw (1,1'1",1‴) according to at least one of the preceding claims, wherein a diameter (D3,D3') of the at least one further thickening (6",6‴) is between 10% and 50% of a thread depth (t) of the thread (3). Screw (1,1'1",1‴) according to at least one of the preceding claims, wherein the at least one further thickening (6",6‴) has a length (a',a") in the direction of the screw longitudinal axis (L), wherein the length (a',a") is less than 5 times a pitch (P) of the thread (3).

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